#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <graphics.h>
#include <dos.h>
/*
* find the points at 0, 30, 60,.., 360 degrees
* on the given circle. x value correponds to
* radius * cos(angle) and y value corresponds
* to radius * sin(angle). Numbers in the clock
* are written using the above manipulated x and
* y values. And the hour needle movement
* is based on this
*/
void calcPoints(int radius, int midx, int midy, int x[12], int y[12]) {
int x1, y1;
/* 90, 270, 0, 180 degrees */
x[0] = midx, y[0] = midy - radius;
x[6] = midx, y[6] = midy + radius;
x[3] = midx + radius, y[3] = midy;
x[9] = midx - radius, y[9] = midy;
/* 30, 150, 210, 330 degrees */
x1 = (int) ((radius / 2) * sqrt(3));
y1 = (radius / 2);
x[2] = midx + x1, y[2] = midy - y1;
x[4] = midx + x1, y[4] = midy + y1;
x[8] = midx - x1, y[8] = midy + y1;
x[10] = midx - x1, y[10] = midy - y1;
/* 60, 120, 210, 300 degrees */
x1 = radius / 2;
y1 = (int) ((radius / 2) * sqrt(3));
x[1] = midx + x1, y[1] = midy - y1;
x[5] = midx + x1, y[5] = midy + y1;
x[7] = midx - x1, y[7] = midy + y1;
x[11] = midx - x1, y[11] = midy - y1;
return;
}
/*
* Calculates position for minute and second needle movement
* Each quadrant has 90 degrees. So, we need to split each
* quadrant into 15 parts(6 degree each) to get the minute
* and second needle movement
*/
void minSecCalc(int radius, int midx, int midy, int secx[60], int secy[60]) {
int i, j = 0, x, y;
char str[32];
/* 15 position(min/sec - 12 to 3) in first quadrant of clock */
secx[j] = midx, secy[j++] = midy - radius;
for (i = 96; i < 180; i = i + 6) {
secx[j] = midx - (radius * cos((i * 3.14) / 180));
secy[j++] = midy - (radius * sin((i * 3.14) / 180));
}
/* 15 positions(min or sec - 3 to 6) in second quadrant of clock */
secx[j] = midx + radius, secy[j++] = midy;
for (i = 186; i < 270; i = i + 6) {
secx[j] = midx - (radius * cos((i * 3.14) / 180));
secy[j++] = midy - (radius * sin((i * 3.14) / 180));
}
/* 15 positions(min or sec - 6 to 9) in third quadrant of clock */
secx[j] = midx, secy[j++] = midy + radius;
for (i = 276; i < 360; i = i + 6) {
secx[j] = midx - (radius * cos((i * 3.14) / 180));
secy[j++] = midy - (radius * sin((i * 3.14) / 180));
}
/* 15 positions(min or sec - 9 to 12) in fourth quadrant of clock */
secx[j] = midx - radius, secy[j++] = midy;
for (i = 6; i < 90; i = i + 6) {
secx[j] = midx - (radius * cos((i * 3.14) / 180));
secy[j++] = midy - (radius * sin((i * 3.14) / 180));
}
return;
}
int main() {
/* request auto detection */
int gdriver = DETECT, gmode, err, tmp;
int i, j, midx, midy, radius, hr, min, sec;
int x[12], y[12], minx[60], miny[60];
int hrx[12], hry[12], secx[60], secy[60];
int secx1, secy1;
char str[256];
time_t t1;
struct tm *data;
/* initialize graphic mode */
initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");
err = graphresult();
if (err != grOk) {
/* error occurred */
printf("Graphics Error: %s",
grapherrormsg(err));
return 0;
}
/* mid position in x and y -axis */
midx = getmaxx() / 2;
midy = getmaxy() / 2;
radius = 200;
/* position to locate numbers in clock */
calcPoints(radius - 30, midx, midy, x, y);
/* gets position for hour needle */
calcPoints(radius - 90, midx, midy, hrx, hry);
/* gets position for minute needle */
minSecCalc(radius - 50, midx, midy, minx, miny);
/* gets position for second needle */
minSecCalc(radius - 70, midx, midy, secx, secy);
while (!kbhit()) {
setlinestyle(SOLID_LINE, 1, 3);
settextstyle(TRIPLEX_FONT, 0, 3);
/* draws frame of the clock */
circle(midx, midy, radius);
/* place the numbers in clock */
for (j = 0; j < 12; j++) {
if (j == 0) {
sprintf(str, "%d", 12);
} else {
sprintf(str, "%d", j);
}
settextjustify(CENTER_TEXT, CENTER_TEXT);
moveto(x[j], y[j]);
outtext(str);
}
/* get the current time using time() API */
t1 = time(NULL);
data = localtime(&t1);
/* draw the second needle in clock */
sec = data->tm_sec % 60;
line(midx, midy, secx[sec], secy[sec]);
/* draw the minute needle in clock */
min = data->tm_min % 60;
line(midx, midy, minx[min], miny[min]);
/* draw the hour needle in clock */
hr = data->tm_hour % 12;
line(midx, midy, hrx[hr], hry[hr]);
/* sleep for a second */
delay(1000);
cleardevice();
}
getch();
/* deallocate memory allocated for graphic screen */
closegraph();
return 0;
}
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